cuetiss



@uitrit tatt getraut @Hirn EDWARD. PLeuRTiss, or MADISON, WIsooNsiN. Leners Parent No. 62,825, dated March 12, 1867.

IMPROVEMENT IN CONNECTING PIS'ION-RODS FOR 'STEAM AND OTHER POWERS.'

fiige ttihule referrer tu in ibase cttits atent mit making part nf tige same.

rro A'LL WHOM IT MAY ooNeEnN;

Be it known'that IEDWAH',D l. CURTI'SS, of Madison, in the coun'ty of Dane, and State of Wisconsin, have invented a new and improved Mode of Connecting and Piston-Rods for Steam or'other Powers, to avoid'centres;

-and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the .letters and igures of reference marked thereon.

The nature of my linvention consists in providing the connecting-rod with suitable parallelograms at a certaindistancc from .the pin Ipassing through it to the guide-box,and the piston-rodwith a. slot `at the outer end, and a pin to correspond with the parallelograms working upon the angular sides, forming a lever power forcing it past the centres.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation, making references, in so doing, to the letters and gures in the accompanying drawing, of Which- Figui-.c 1 'represents a perspective view,

Figure 2, a sectional view, showing the inward vbackward motion as the connecting-rod is raised'over the centre. i y

Figure 3, a sectional view of the connecting-rod as it is forced past the centre on the inward forward motion.

I construct my connecting-rod K with suitable anges L L on the inner end, to. place two parallelograms,

A A, with their shortestpoints on a line with the centre of the connecting-rod K, the thickness of4 the pin B above and below, as represented in gs. 2 and 3. I provide the piston-rod M with a suitable slot, C, in the outer end to allow the pin B to pass around 'the parallelograms A A;. also with a movable pin, B, which coming in contact with the angular sides'of the parallelograms A A forms a lever power which causesthe outer end of the connecting-rod to raise or lower, as the case may be, according to the position of thecrank H. I provide the pin B with a suitable pin, E, and slot D, to. move it to the opposite side of the piston-rod M to reverse the motion. The parallelograms AA are placed at. opposite angles `from each othexyand must be constructed in size and shape to correspond with the length of stroke, length of the slot'C, and the distance of the pin B from the slot C. The longer the slot C, and the farther the pin B from the slot C, the morepower is gained in passing the centres.

What I claim as my invention, and desire to secure by Letters Patent, is-

The parallelograms A A, the anges LL that support them, the pin B that works on tlexvnllgul'ar sides of the i parnllelograms A A, the pin E, and slot D, which moves the pin B to the opposite side ofY the piston-rod M, which reverses the motion, and the slot C, which allows the lpiston-rod M more stroke for the pin B to pass around the parallelograms A A, coming in Contact with their angular sides, forces the connectingrod past the centres to work substantially as herein s et forth.

' EDWARD P. CURTISS.

Witnesses:

R. J. TAYLon, A. O. 'KENDALL 

